This is a swivel ball link set by Dubro. This set is designed for use with 4-40 threaded rods.
Includes: Two ball links with inserted brass swivels, two 2.2x13mm hex head screws, two 5x3x2.5mm brass spacers and two silver 2.2 hex nuts
Requires: 4-40 rods and assembly onto kit
Length: 25.2mm (0.994)
Inside diameter of swivel: 2.8mm (0.112)
Note: The screws used to mount the link are 2-56 size.